Bit for mining-machines of the cutting-chain type.



C. N. BARTON.

BIT FOR MINING MACHINES OF THE GUTTING CHAIN TYPE. APPLICATION FILEDJUNE 4, 1910.

5 Patented Sept. 27, 1910.

mum Ill WITNESSES CHARLES N. BARTON, OF HARRISBURG, ILZIITOIS,ASSIGIEFGR OF BITE-HA1? T0 JAEKEQ I8. BLACKMAN, 01F HARRISBURG,ILLINOIS.

BIT F018, .MINING-TJIACHENES 9F THE CUTLDIG-GEAL I To all whom it mayconcern:

Be it known that 1, CHARLES N. BARTON, a citizen of the United States,residing at Harrisburg, in the county of Saline and State of Illinois,have invented new and useful llnproven'ients in Bits for Mining-Machines of the Cutting-Chain Type, of which the following is aspecification.

The present invention relates to improvements in n1ininginachines of thecutting chain type, and more particularly to the novel structure ofcutting bit or tooth therefor, and has for its purpose to provide a bitwhich may be reversed in its mounting and "perform its function.

In machines of thecutting;- chain type as now employed. the hits aredesigned to cut in one direction only, with the. result that. it isnecessary to resharpen the hit or replace the same when the bit, hasbecome (hill.

The purpose of the present invention is therefore to construct a bitwhich will subserve its intended function and require only one-half ofthe sharpeningnecessary on hits of th aforesaid kind.

The invention further contemplates a novel type of lug, and withdesigning opposedsides of the bit with corrugations whereby itssecurenient within the lug is rendered more positive and consequentlyless liable to become loose through the cutting operation.

With the foregoing object in View, the invention is shown in itspreferred structure in the accompanying clawing, wherein Figure 1 is aside elevation of a chainlink, showing the bit in its applied positionthereon. Fig. 2 is a top plan View of Fig. l, and; Fig. 3 is-a detailperspective view of the hit.

Referring to the several parts in further detail, and with likecharacters of reference indicating corresponding parts in the severalviews shown, 1 designates the chain link having an upward and diagonallydisposed shoulder or lug 2, which is formed integrally therewith. Saidlug 2 is provided with a slot or key-Way 3 which extends through the lagand link structure. Said slot 3 designed to receive and have se-Specification of Letters Eatant. P5 1 ignites Sept. 2 i Applicationfiled June's, 1919.

Serial f lo. 585,135.

cured therein the hit 4 which is of that structure disclosed in Fig. a

The hit, 4: consists of a spike-like structure, having the usual shankor hotly-pol tion- The head 5 of the hit is of Wedge design whereby toprovide a pair ot like faces 6 and acutting edge By thus constructingthe hift either or both of the faces t3 may be machined when it isdesired to sharpen the edge 7?, and by reason of thus disposing the saidcutting member 7, it will he apparent that the hit is subject to bereversed in its position for its cutting action.

The means for securing the hit in position comprises a clamping orimpinging bolt 28 having a conical end 9 designed to engage with teeth10 formed on opposite faces of the shank of the hit, in that mannershown in Fig. 3. The said bolt 18 has screw thread ed connection withthe lug 2 through an aperture 11, which aperture has conininnicationwith the key-way B, shown in Fig. l. The face 12 ot' the lug 2 is oislight concave design whereby to give full client to the cutting toothor hit when in operation.

From the foregoing description it "will he apparent that the cuttinghead 5 may he reversed when the cutting edge 'i" has become worn ordeflected and thus attends what virtually a substitute hit. find it willl3t3 further apparent; that the life of the hit will be substantiallydoubled itor the reasons stated.

hat is claimed i":-

The combination a chain oi? a mining machine having" a diagonallydisposed and oil-standing log with n diagonally disposed key-way formedtherein; cit a cutting hit comprising :1 substantially straight memberprovided with-a cutting edge disposed intermediate opposite sides of thehit and adapted to have its position reversed for the cutting operation,said Ehithaving corrugations termed on opposite sides out the shankporion thereof and adapted to be secured within the diagonal y disposedkey-way, a screw threaded aperture formed in said lug and communicatingwith the hit key-way, a screw boll; iitted THE within said screwthreaded k'eyqvay and having its end constructed to impinge with set myhand in presence of'two subscribing the corrugations of the bit shankand hold witnesses.

the bit in position, and the outer face of 1 CHARLES N. BARTON.

5 the lug through which the cutting end pro- Witnesses:

trudes being recessed whereby to expose the \VM. L. DERRIs, J r., fullcutting point of the bit. RIoHn. D. OZMENT, Jr.

In testimony whereof i have hereunto

